here is a rough estimate of the levels of the last boss in the challenges
![[Image: alEXLw9.png]](http://i.imgur.com/alEXLw9.png)
notes
1. hp = lvl*lvl + 5, but for bosses it is 4x this value.
i.e. hp = 4*(lvl*lvl + 5)
2. the second set of duo and group levels (in red) shows the level of the boss if hp is divided evenly between the players
i.e. on average the duo or group must be able to defeat that level boss for the whole group to be able to defeat it.
notes
1. hp = lvl*lvl + 5, but for bosses it is 4x this value.
i.e. hp = 4*(lvl*lvl + 5)
2. the second set of duo and group levels (in red) shows the level of the boss if hp is divided evenly between the players
i.e. on average the duo or group must be able to defeat that level boss for the whole group to be able to defeat it.